It's a long, grinding game of patience and attrition. And that's because it's all about tediously waiting for the percentages to line up in your favor -- successful poker players only play about 20 percent of the hands they're dealt. That's right -- 80 percent of the time, they're spectators. And, they know exactly what percentage of hands they're playing, because this is the type of minutiae they keep track of. People think that poker is all about reading facial expressions, but it's actually all about math. In fact, many poker pros -- especially the online players -- are outright stats junkies, entering the details of every single session into analysis programs to calculate their overall win rate and help them fix any holes in their games. Here's what a typical pro's post-game analysis might look like.